19674649 has 2 divisors, whose sum is σ = 19674650. Its totient is φ = 19674648.

The previous prime is 19674647. The next prime is 19674653. The reversal of 19674649 is 94647691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15264649 + 4410000 = 3907^2 + 2100^2 .

It is a cyclic number.

It is not a de Polignac number, because 19674649 - 2¹ = 19674647 is a prime.

Together with 19674647, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19674599 and 19674608.

It is not a weakly prime, because it can be changed into another prime (19674643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9837324 + 9837325.

It is an arithmetic number, because the mean of its divisors is an integer number (9837325).

Almost surely, 2^19674649 is an apocalyptic number.

It is an amenable number.

19674649 is a deficient number, since it is larger than the sum of its proper divisors (1).

19674649 is an equidigital number, since it uses as much as digits as its factorization.

19674649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 46.

The square root of 19674649 is about 4435.6114572852. The cubic root of 19674649 is about 269.9618098705.

The spelling of 19674649 in words is "nineteen million, six hundred seventy-four thousand, six hundred forty-nine".